To me it sounds like that camera is beyond economic repair if you need a repair man to fix it for you. However, it does not mean that the camera cannot be repaired by someone. In my experience, electrical problems are frequently caused by corrosion of internal wires and solder joints. Mechanical problems are often caused by lack of lubrication and general gumming up of the mechanism, rather than something breaking. My recommendation would be to sell it on with a clear description of the faults you have found and use what you make (it will not be much, and it might not sell) to find a working body. If you really want to have that particular camera fixed for sentimental reasons, someone with experience of cameras of that era may well be able to get it working for you, but it might be expensive and not even possible if a component is actually broken.
If you are willing to make the effort, it might be possible that you can fix it yourself. Plenty of people do, and in the process they learn new skills that mean that they do not have to rely on repair techs to keep these old cameras going. However, if you make a hash of it, that camera may never be of any use to anyone again; hence my advice to sell it on as is.